Related electronic products, such as Mechanical watches ,bank cards, mobile phones, computers, televisions, pacemakers, etc., they are easily affected by neodymium magnets, please keep a certain distance to avoid unnecessary losses. When connecting two magnets, draw them close to each other slowly and gently. Hard crushing would cause damage and cracks in the magnetic material ,The NdFeB magnet have unbelievable magnetic performances , Don't hurt your hands when in use • Grade: N42 • Max Working Temperature: 80°C/176°F • Tolerance: Apporx 0-0.4mm • Plating: Nickel + Copper + Nickel Triple Layer Plated • Disc Magnet high strength • NdFeB high quality product • Corrosion free coating • Applicable multiple purposes • Condition:100% Brand new and high qua • Magnetizing direction: N-S-pole in the two largest surface • Note: the bar magnets are very fragile. It is forbidden to collide with other metal objects (including other magnets), so be careful when trying to separate them